What is the unit vector in the direction of $\hat{i} + \hat{j} - \hat{k}$?

Explanation

1. 01

   Divide the vector by its magnitude, $\sqrt{1 + 1 + 1} = \sqrt{3}$.

2. 02

   $\hat{a} = \frac{1}{\sqrt{3}}(\hat{i} + \hat{j} - \hat{k})$.